Full-stroke device for calculators.



W. FUHRMANN. FULL STROKE DEVICE FOR CALCULATORS.

APPLICATION FILED SEPT. 30, 1916- I Patented July 3, 1917.

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[NVENTUHJ- MRRE FUHRMANN 5y hi3 Alto/ 1 7 ,W'APQREN- FUHRMANN, @F W'ES'IFIELD, NEW JERSEY, ASSIGNOR T0 ADDOMETER COR IPOTtdTIUN, 0F NEW YOlFtK, N. Y

A CORPORATION 01* UELAWARE.

I FULL-STROKE DEVICE FOR CALCULATORS.

' Specification of Letters Patent.

Patented July 3, 1 91 "5;

Application filed September 30, 1916. Serial No. 122,979.

0 all whom it may concern:

Be it known that l, WARREN For-reruns, a citizen of the United States, and resident of Westiield, in the county of Union and State of New Jersey, h so new and useful Improvements in Full- Stroke Devices for Calculators, of which the following is a specification.

This invention. relates to calculating; or similar niachines 01"" the character in which a main opera ting member is provider which is connected with the mechanism operated tl'lerehy, such as a main shaft, by rooms of a flexible or spring connection that is de signed permits yielding ellect durlig rapid operation or the main operating, mem ber, whereby parts of said mechanism are not forced to operate at the same speed asthe operating member, but may move at slower speed; the force exerted by said main operating member being stored up in said flexible or spring connection so that the full and complete movement of the re tarded parts of the mechanism is insured.

The invention mainly consists in the provision or a pair of reversing pawls that will compel "hill movement in both the advance and return of the handle and parts oper ated thereby, in connection with which one of the paw ls is provided with means for arresting handle and certain parts when fully advanced by rapid stroke in which the main. sh aft is retarded, by means of resilient connections whereby the handle is held in the forward position until the main shaft and other parts complete their forward or advanced movement, whereupon this pawl will release the handle and permit the sev- 3 parts to eturn normal position,

s showing one emhosjli lent, Figure l is a side '"ard seen on the line l? 4- partial 'V'lWJ 2 llllll with pitnian e a advanced, View of a shown in is horizontal s action on tl Fig. l: and 7 and S parts for controlling" the rwersing pawls.

The construction illustrated is especially designed for use with licsihle handle invented certain pull and. controlling parts as set forth in ,a pending application, Serial No. 54,313, but 1s applicable to other constructions of chines of this character.

As shown in the drawings 1 provide is crank 2 fast on an operating shaft 40, that swings in the side plate 1. A pitman 3 is pivoted to the crank 2 and extended rearward to connect with a crank 4 fast on 'a. main shaft 5 at the rear.

The machine is operated by a handle 23 so a short spindle 24: that rocks in bearings 25, and which spindle carries a segment 26. This segment has a notched periphery coiiperating with two pawls 27 and 28 that alternately act to compel full stroke of the handle, in each direction. When the handle is drawn forward the pawl 27 falls sue;- cessively in the segment notches andwill prevent reverse movement of the handle and segment until the end of the stroke is reached, when by certain means this pawl is thrown up to free the segment therefrom, for its return by the actuating means: During the return movement of the handle and segment the pawl 28 permitted to fall successively intot'he notches and prevent the h andle being drawn forward again during the return movement, until thcsdgment and handle reach the end of the return stroke. It is to he understood that the spindle 24 is free from the front shaft 4;(], and only connected therewith by mechanism hereinafter set forth.

A bar 30 has one end pivoted on the seg;- ment 26 to he moved back and forth by the handle. The rear end of the bar 30 connected one or more springs 31 with the 'yiiiznan. 3, and these springs are held under tension reason of a pin '3, extending into a slot 53 in the bar 60, the springs holding the pin normally st the forward end of the slot, asshown in 1 and 2. By this means when the handle is drawn forward to swing the segment 26, the bar 30 will draw the pitman 3 forward through the 31, and 11ndcr normal conditions thcsesprings will not stretch; but if the handle drawn rapidly to its forward position the will yield to resistance of the crank 4 and the pitinan 3 will advance later than the bar 30, and hence the pin 32 will more back in the slot 33, as indicated in Fig. 2.

The rear end of the bar 30 contains a slot l? on the pit-man m which slides a stud 36, fast to one end portion 37 of-a plate or frame 38, shown separately in Fig. 6. The other end of the plate 38 contains a slot the crank pin 10, so that the plate may have a sliding movement on the crank pin, the plate being'guided by the head on the crank pin 10. Pin 10 moves 1n a slot '11 in pitman 3. The plate 38 has an open portion 41,. being in the form of a frame, so that springs 31 can freely operate upon the pitman 3. This plate 38 is shown as provided with extensions 43 and 44 to which are secured the main springs 45 and 160f the machine; the rear ends of these springs being secured to studs 4:7 and 48 on theside plate 1. Theseisprings will draw the plate 38 rearwardly, and its slotted rear end 39 will engage the crank pin 10 and move the crank to thelimit of its rearward position. The bar 30 is shown provided with a pair of arms 50 and 51, that carry springs 52 and 53 extending rearward and connected with the end member 37 of the plate 38. But these springs are weak in their operation compared with the springs 31 connecting thepitman and bar 30.

When the handle and segment 26 are moved forward to the limit of the advance movement, the pawl 27 'will engage a notch 56, (see 2) and lock the segment and handle in this position. Since the bar 30 pivoted to the segment 26, is connected with the pit-man 3 by springs 31, it the handle is drawn quickly forward these springs will stretch and the pitman will have aretarded advance. This will cause the pin 32 to move rearward inthe slot 33 as indicated in Fig. Means are provided controlled by the pitman 3, for holdingthe pawl 2? in the locking position of Fig. 2, until the pitman advances its full stroke, whereupon this pawl 27 is swung to release the segment. As shown I provide a lever 57 pivoted on the pin T ct the pawl 24 and normally drawn rearward by a spring 58, the arm 59 of this aging a pin 60 on the pawl that .3 the pawl from the segment. The spring a is much stronger than the spring 61 that draws the pawl against the segment, hence when the lever 57 is not restrained it will hold the pawl 27 away from the segment. A. latch 62 has a notched end 6 arranged to engage a rear shoulder 68 on the lever 57, and is pressed to this position by aspring 6 In the normal position of Fig. 1 the latch 62 will hold the lever 57 in the forward position to 'free the pawl 27, and permit the pawl to be drawn against the notched segment to engage its notches during the forward movement of the segment.

{But when the pitmzn 3 is drawn fully forward, a stop arm 65 fast thereon will strike an arm 66 on the latch 62 and move it to release the lever 57. Hence this lever will-be 39, in which slides against the segment.

.mal position, this plate engaging than the main springs,

of the forward stroke of the pitman 3-. It will thus beseen that the segment 26 will be held in the forward position when the pitman is retarded, until the} pitman completes its forward stroke, when the pawl will release the segment. However, in the normal operation the pitman in unison with the bar 30 and hence at the end of the stroke the pawl 27 will be at once raised from the segment. I

At the end of the return stroke of the segment 26, a pin 77 on the segment will strike an arm 780i the lever 57, and swing the lever to tension its spring lever to be relatched by the latch 62, thus releasing the pawl 27 to be" drawn against the segment .by its spring 61. 4

Means are provided whereby the other pawl 28 is raised from the. segment 26 dur- 3 moves forward I 58, and permit the ing the forward stroke,'and released to oper- I A lever 6'7 is pawl from being pressed by its. spring 69 The lever 6 has an arm 70 whose pointed extremityengages in notches in an arm 71; which arm is pressed against the "arm 70by a spring 72, whereby the lever 67 is'held in either of the two positions. In" the position shown in Fig. l'the pawl 28 is-held away from thesegment, but at the end of the forward man 3, a stop arm 73 fast on the pitman strikes an arm on the lever 67 to shift this lever to its othernotch engaging position, that will permit the pawl 28 to be drawn against the notched segment. At the end of the return stroke of the segment, a pin 74-. on the segment will strike the arm 7-5 and swing the lever that will. raise ment 26.

The operation of these parts is as follows: The main springs 45, as always exert a rearward draft on the plate 38, and in its northe crank holds the crank and shaft pin 10,

its movement. The springs 31 ten limit of 67 to its former position, the pawl28 from the seg- 5 atthe sioned between the bar 30 and the pitman 3, retain these members with the pin 32 engaging the forward end of the: slot 33 in the bar. The springs 52. and 53 that are tensioned between the arms on the bar 30 and the plate 38, since they are much weaker bar 30 rearward. The bar 30 being connected with the piman 3 through the springs 31, the bar and pitman will be both moved rearward until the pitman has the forward end of its slot 11 engaged by the crank pin 45, 46, will draw the v 10, that will limit the rearward movement of the pitman. The connection between the bar 30 and the plate 38. by. stud 36 on the e plate Q6 forward from the normal. posltlon,

plate riding in slot 85 on the bar, is so erranged that in the described position of the parts, this stud is at'ithe forward portion of the slot llpon draining thcf-h'a-ndle end segment by a slow movement, the her 30 will be cairried forward. The springs 31 connecting the bar 30 with the pitman 3, will cause the bar andpitmen to; move forward in unison, and the bar at this initial movement will draw forward on the light springs 52 and 53; but the latter connecting with the plate 38, will not advance this plete'oc- 3,5 cause of the much greater opposed tension of the main springs and 46. Hence the plate 38 and stud 36 will remain stationary until the slot 35 in-the'oar 30 moves on the stud and its rear end engages the stud, whereupon the her 30 will. from this time forward cause the plate 38 to move ahead in unison therewith. l3ut the initial movement oi? the bar 30 and pitinen 3, plate holds the crank pin 1G in its rear position EziJ-SLlCll time, will cause the movement of the slott d end ll of the pitman on the cranlr. pin 10. This movement of the crank pin 16 in the slot l1 is identical with that of the stud in the slot whereupon as soon as the bar 30 hesuclvauced sullicient'to carry the plate 38 ahead with it, the pitnian 3 will have advanced its slot sullicient to engage the crank pin,

and cause the crank l to be advanced by r the pitnian. This will have the effect ct causing the? slotted end of the plate 38 to advance in unisor 'ith the forward movement of the crank pin 10 that rides in such slot. These several parts will continue their forward movement in unison to the end of the stroke. llhen the handle is released, the springs 45, e5, will return-the parts in the same relative positions in which they advanced alter the said initial movement; until the crank reaches the limit of its return movement, that will arrest the rearward .movement of the plate 38. But the tension of the springs 52, will draw rearward on'the our 3i). that will. cause its {in rear slotted end to n'iove rearward on the stud And it will he understood that the pitinan will partake this additiouuf rearward movement of the her 30, that the pitnian will have a rearward. znovcn'ient and its slotted curl 11 will move to the rear on the crank pin 10, that will bring parts to their former positions.

lVhen the handle and her 30 (ii-evenforward rapidly, the re stance of the parts connected with. the shut-it will cause the pitman 3 to advance slower than the movement of the bar 30; which is permitted hy the stretching of the springs 31 connecting the bar and the pitnian. int it is to he understood that the initial movement of the new liar 30 will cause the pitman 3 to move in unison therewith until the crank pin. 10 reaches the other end of the slot 11 in the pitinanfi, that will serve to retard the advance of the pitniau, after it and the bar have made this initial movement in unison. The further advance of the our 30, as stated, will stretch the springs 31, hut the plate 38 after the said initial movement will he carried along with the bar 30 by the.

stud 36. Hence the plate 38 will move forward while the crank pin 10 and pitman will have a retarded movement, causing a rearward movement of the crank pin relative to the slotted end 39 oi. the plate. As soon as the handle end her 30 reach the limit of the forward position, the latch pawl 27 will engage the segment 26, and lock the bar 30 in the forward position, (see Fig. 2) The plate 88 will also be locked in this forward position, but the now extended springs ill. will cause the further advance of the pitnian 3 for the-limit of its forward movement, that will insure the full movement of the crank and connected parts The pitn'iauj will move forward until the stud 32 reaches the end of the slot (lurin which movement stop on the pitinon will. rilre the latch and shift it to free the pawl 27', to releas the men This will release the bar 30 and connected parts, that will return. to their normal posi' tions, as has been set forth.

ln the normal posutlon as shown in Fig. 1 it will be seen that the pawl 28 elevat d from the se nient its the pitinan reaches the end of its forward stroke, the arm thereon will ilre the arm the lever 63', causing this lever to swing end permit the pawl 28 to be swung down on the segment with its pin 68 now free from the lever (37. Therefore, during the return stroke the pawl 28 will successively full in the notches and prevent zulmncc of the seginent. At the end. oi the return stroke the pin H on the segment will engage the arm 3'5 and swing the lever 67 that will engege the pin 68 on the pawl 28 to raise the pawl from the segment. The arm '50 of lever 67 will engig lteruately the two notches of the arm ,l and retain the lever in the two said poi' in a normal crut' n the machine when. the handle i... pulled forum-ll at the all hack oi the notch us the latch to release the lever 57. The arm 59 on the latter will engage the pawl 27 and lift the pawl free from the segment. This is done at the latter part of the forward stroke and hence the segment 26 will not be locked in the forward position. It is only upon ab normal pull of the handle that the springs 31 stretch causing the retarded advance of the pitman, whereupon the pawl 27 holds the segment and handle forward until the pitman completes its retarded forward stroke when the segment is released.

Having thus described my invention what I claim is 1. The combination of a toothed segment,

a handle attached to the'segment, an operating bar, a spring connection between the bar and the segment, a swinging pawl, a spring arranged to hold the pawl against the segment, meansarranged to overcome the spring and hold the pawl away from the stroke of the segment, means bar and the segment, a

se ment, means arranged to disable said he arranged to restore said holding means at the final part of the advance of the operating bar, where- .by'to free the pawl from the segment.

2. The combination of a toothed segment,

a handle attached to the segment, an operating bar, a spring connection between the swinging pawl, a

spring pressing the pawl against the. segment whereby when the segment is'drawn to swing it forward the pawl will'engage the segment to prevent reverse movement thereof, a spring lever arranged to engage said pawl v away from segment-engaging position, a latch arranged to engage sai spring lever to hold it in position to release said pawl. for engagement with the segment, a stop on said operating bar arranged to engage said latch advance movement of the bar to swing the latch and free the spring lever, to swing the pawl to free the segment, and means to restore the spring lever to said latched position at the end of the return stroke of the bar.

3. The combination oi: toothed seginent, a handle attached to the segment, an"'operating bar, a spring connection oetween the bar and the segment, a swinging pawl, a spring pressing the pawl against the segment whereby when the segment is drawn forward the pawl will engage the segment to prevent reverse movement thereof, a spring lever arranged to engage saidpawl from segment-engaging position, a latch arranged to engage said spring lever to hold it in position to release said pawl for engagement with the segment, a stop on said operating bar arranged. to engage said latch at the final portion of the advance movement of the bar to swing the latch and free the spring lever, to swing the ding means at the end of the return at the final portionof the spring pressing the second segment to prevent 4:. Thecombinationof a toothed segment,

a" handle attached to the segment, an operconnection between the ating bar, a spring a swinging pawl, {a

bar andthe segment, spring pressing the pawl ment whereby when the segment is drawn forward the pawl will engage the segment to prevent reverse movement thereof, a spring lever arranged to engage said pawl to swing it away from the segment-engaging position, a ranged to engage it in position to release said pawl for engagement with the segment, a spring tending to hold the latch in said latter position, an arm on said" latch, a stop onsaid bar arranged to engage said latch armat-tlie latch having a note final part of the advance ofthe bar to swing the latch and shift its notched end agamst the force of said spring away from the spring lever and permit the spring lever to shift the pawl away from the segment, an arm on the spring'lever, and a stop on the segment arranged to engage saidlat-ter arin at the finalportion of the latter stroke of the segment whereby to relatch the spring lever to free the pawl. i;

5. The comhination'of a toothed segment, a handle attached to the segment, an operating bar, a spring connection between the bar and the segment, a swinging pawl, "a spring pressing pawl against the segment whereby when thesegment is drawn forward against the seghed end ary said spring lever to hold the pawl will engage the segment to prevent r reverse movement thereof, a spring lever arranged to engage said pawl to swing it away from segmentengaging position, a latch arranged to engage said spring lever to holdiit in position to release said pawl for engage ment with thesegment, a stop on said operating bar arranged to engage said latch-at the final portion of the advance movement of the bar to swing the latch and free the spring lever, to swing the pawl to free the segment, means to restore the spring lever to said latched position at the end of the return stroke of the bar, a second pawl, a pawl against the reverse movement of the segment during handle and segment, a lever arranged to engage the second pawl to hold it free from the segment, means to swing'said lever to free the second pawl at the end of the advance stroke of the bar, and means to swing said latter lever at the end of the return stroke of the operating bar to shift the second pawl away from the segment.

6, The combination of a toothedsegment,

return stroke rot th ef 126! a handle attached to the segment, an oper- 13o ating bar, a spring connection between the the handle and segment, a lever arranged to bar and the segment, a swinging pawl, engage the second pawl to hold it free from means arranged to hold the pawl away from the segment, means to swing said lever to 15 the segment, means arranged to disable said free the second pawl at the end of the ad holding means at the end of the return Vance stroke of the bar, means to swing said stroke of the segment, means arranged to latter lever at the end of the return stroke of restore said holding means at the final part the operating bar to shift the second pawl of the advance of the operating bar", whereaway from the segment, an arm on said 20 by to free the pawl from the segment, a seclever, and a double notched strip that is 0nd pawl, a spring pressing the second pawl spring pressed against said arm to retain against the segment to prevent reverse moveit in the two' said positions.

ment of the segment during return stroke of WARREN F UHRMANN 

